Hi, Im building a Mild 400 engine and I just custom made some headers. These start with 2" tubes from the heads and each 2 tubes of 2" go into a 2 1/5" tube that goes streight and into a curv to my back door giving me 4 exhaust pipes of 2 1/5" each, I have absolutley no smog devices in my car, just 4 normal tube silencers (cherrys). What effect can this bring to my car ? Is it too much escape a bad thing ? Thanx

 

Seems a mite large for tubing for a mild 400 build. It may cut your low end torque and economy some.

 

upsss, that means it will kick my dynamic compression ratio down right ? and what about high end horses ? although I am running a wild cam a 282 degrees intake 290 degrees exhaust